CA1172204A

CA1172204A - Fish drum

Info

Publication number: CA1172204A
Application number: CA000379055A
Authority: CA
Inventors: Theo Hammes
Original assignee: Mauser Werke GmbH
Current assignee: Mauser Werke GmbH
Priority date: 1981-05-26
Filing date: 1981-06-04
Publication date: 1984-08-07
Also published as: SE8103193L; SE442981B; GB2098968B; GB2098968A

Abstract

ABSTRACT OF THE DISCLOSURE
The invention provides a blow-moulded plastic drum having a drum opening and a lid adapted to be mounted thereon, an outwardly directed flange molded directly from the drum wall and mating with a corresponding flange on the lid, said outwardly directed flange being spaced below the rim of the drum opening, said lid having an inner wall for insertion into the drum opening to a point below the outwardly extending flange on the drum wall and an outer wall carrying said corresponding flange, said lid defining between said inner and outer walls and with the rim of the drum opening a space for receiving a sealing ring when said flanges are held in mating engagement by means of a tensioning ring, and radially extending stiffening ribs between the inside of said inner wall and a bottom recessed wall of the lid, said inner wall of the lid extending alongside the drum wall when the lid is inserted whereby the inner wall of the lid acts as a reinforcing member to prevent deformation of the drum open-ing.

Description

'l`he presellt invelltion relates to a blow-moulded plastic drum havinq a lid suitable for containing fish and like products.
The plastic drum has an outwardly directed flange disposed below the drum opening and spaced therefrom and formed integrally with the drum wall. In the presence of external axial stresses the outwardiy bent flange of the lid mounted on the neck of the lid rests on the flange, while an inner rim of the lid, which protrudes beyond the deep drawn lid bottom, rests on the neck of the drum. A ~sealing ring inserted between the inner rim of the lid and the outer rim is pressed against the upper edge of the neck by means of a tensioning ring encompassing the flange of the drum and the outer rim of the lid.
In the filled state drums of the described can be stacked upright one above the other in columns without having to be concerned about deformations and leaks in the drum-lid seal.
Furthermore, the sealing ring between lid and drum cannot be crushed or displaced from its seat in case of intense externally increasing axial loads since the lid is limited in axial move-ment by the flange of the drum, the flanged ring being opposite the outer rim flange of the lid. The tensioning ring which holds the lid on the flange of the drum prevents the lid from being lifted from its sealing position when the internal pressure of the drum increases.
However,ifdrums ofthis kind are stored horizontally or stacked horizontally in several layers, one above the other, leaks occur in the closed position of the lid since the wall region, which is reinforced by the solid flange, and the ad-joining neck are deformed as a result of non-uniform radial stresses.
However, for certain contents the drum has to be stored in the horizontal position for the drum preservation purposes.
For example, fish is stored with brine in shipping casks. The 1~'7~
cas~s~ w}1ich are made of wood, must ~e stored in the horizon-tal position, so that the ~ish remains submerged in the brine. For this purpose each cas~ must be rota-ted about its longitudinal a~is at specific intervals.
Two planks are inserted in each row of casks between each layer of casks stacked horizontally one above the other.
The planks cross the longitudinal axis of the cask in the region of both the top and the bottom. In order to turn the casks to keep the fish submerged, the cask layers are rotated,rearranged from the top to the bottom and stacked again. ~
Since metal drums cannot be used for storing and ship-ping fish, wood casks are used. Wood casks can withstand the non-uniform radial pressure when stored and stacked horizontally and do not affect the contents. The production of this kind of wood cask is costly and so is the preparatory work required for filling the casks since they must first be soaked in water to make them watertight. Furthermore the fact that they can be used only once is also a disadvantage. The risk of breakage when filled wood casks crash from the stack or in the case of rough operating conditions is particularly great.
Therefore-, it is the aim of the present invention to so design plastic drums of the kind described at the outset that a horizontal storage is possible without the risk of leaks in the event of non-uniform pressures acting laterally on the drum wall. Moreover the horizontal stacking of filled drums in several layers one above the other with the aid of inserted planks is desirable even at high specific loads per unit surface. In this manner the re-use of conventional plastic drums which are favourable for storing food and have a capacity in excess of 120 litres is utilized.
It is in-tended to stack at least four layers of filled drums one above the other over lengthy periods.

~L~'7~ 4 ~ ccordill~3 to the present invention there is provided a blow-moulded plastic drum having a drum opening and a lid adap-ted to be mounted thereon, an outwardly directed flange moulded directly from the drum wall and mating with a corresponding flange on the lid, said outwardly directed flange being spaced below the rim of the drum opening, said lid having an inner wall for insertion into the drum opening to a point below the outwardly extending flange on the drum wall and an outer wall carrying said corresponding flange, said lid defining between said inner and outer walls and with the rim of the drum opening a space for receiving a sealing ring when said flanges are held in mating engagement by means of a tensioning ring, and radially extending stiffening ribsbetween theinside ofsaid inner wall and a ~ottom recessed wall ofthe lid,said innerwall ofthe lidextending alongsidethe drum wall whenthe lidis insertedwhereby theinner wallof thelid actsas a reinforcing memberto preventdeformation ofthe dr~imopening.
For a particularly resistant reinforcement of the lid a preferred embodiment of the invention provides that the inner rim of the lid is extended downwards beyond the lid bottom and that a second ring projection is moulded to the lid bottom concen-trically to the extension. The two ring projections are connected to eachother via radial ribs protruding from the lid bottom so as to form a circular box support.
In cases of long-term stresses of large-volume drums the stiffening ribs can be distorted so that the lid loses some of its stability, but these are exceptional cases.
In order to counteract this, the inner rim of the lid abuts against a rigid insert panel, whose outer rim, in the inserted state, extends to the inside surface of the inner lid rim. On the outer periphery of the insert panel notches are provided as openings for the stiffening ribs.
The insert panel can be designed, for example, as a :~ ~'7;~
?OO~1 ~'~111~` 1 .
The in~elltion will now be described in more detail, by way of example only, with reference to the accompanying drawings, in ~hich:-Figure 1 shows a drum with the lid mounted thereon inlateral view partially cut away;
Figure 2 shows the cut-out portion of Figure 1 on an enlarged scale with the insert panel in the inserted position.
The drum 1 shown in the Figures is closed by means of lid 2. The flange 5 extends radially outwardly and is moulded integrally with and directly from the drum wall below the drum opening and spaced therefrom. The drum neck 9 rises above the flange 5 (Fig. 2).
When the lid 2 is in place the outwardly directly flanye 4 of the outer lid rim 14 faces the drum flange 5. A sealing ring 7 is inserted in the space between the outer lid rim 14 and the inner lid rim 6. By means of the tightening ring~ the lid 2 is sealingly pressed via the sealing ring 7 against the upper edge of the drum neck 9. The tightening ring 8 encompasses the conical bottom side of the flange 5 and the upper side of the outer rim flange 4, which also is conical. In the pressure of external axial stresses, the lid 2 above the flange 5 is limited in axial movement so that the sealing ring 7 can neither slip nor be damaged.
The deep-drawn lid bottom 3 extends into the drum opening to a point below the surface of the flange 5. The inner rim 6 of the lid is rigid and thus forms a non-flexible support for the flange 5 so that in the event of radial stress of the drum 1 the position of the seal cannot be changed. Lid bottom 3 and inner lid rim 6 are connected to each other by means of radial reinforcing ribs 10.
The inner lid rim 6 extends downwardly from the lid ~ottom ' to a ring projection 12. A second ring projection 13 havillg a smaller diameter is disposed concentrically with res-pect to the projection 12. The two ring projections 12 and 13 are connected to each other by radial ribs 11, which are moulded from the iid bottom so as to form a box support, thus providing additional circular stiffening of the lid bottom and of the inner rim 6 of the lid.
As is also evident from ~igure 2, the lid 2 is rein-forced by means of a rigid insert panel 15. The outer rim 16 extends to the inner surface of the inner rim 6 of the lid. On the outer circumference of the insert panel 15 notches 17 are provided as openings to receive the stiffening ribs 10.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A blow-moulded plastic drum having a drum opening and a lid adapted to be mounted thereon, an outwardly directed flange moulded directly from the drum wall and mating with a corresponding flange on the lid, said outwardly directed flange being spaced below the rim of the drum opening, said lid having an inner wall for insertion into the drum opening to a point below the outwardly extending flange on the drum wall and an outer wall carrying said corresponding flange, said lid defining between said inner and outer walls and with the rim of the drum opening a space for receiving a sealing ring when said flanges are held in mating engagement by means of a tensioning ring, and radially extending stiffening rib, between the inside of said inner wall and a bottom recessed wall of the lid,said inner wall of the lid extending alongside the drum wall when the lid is inserted wherehy the inner wall of the lid acts as a reinforcing member to prevent defor-mation of the drum opening.

2. A plastic drum according to claim-l, wherein inner wall of the lid extends downwards beyond the recessed bottom surface of the lid to form an extension, and a ring projection is moulded to the underside of said bottom surface concentrically with respect to the extension, said extension and projections being connected to each other by means of radial ribs projecting from said bottom surface so as to form a circular box support.

3. A plastic drum according to claims 1 or 2, wherein the inner wall of the lid is additionally supported by means of a rigid insert panel whose outer edge, in the inserted state, extends to the inner surface of the inner wall of the lid, the outer circumference of the insert panel being provided with nothces to receive said stiffening ribs.